Gastroduodenal ulcers are probably no rarity in children. Clinically relevant are only those showing complications: either bleeding or perforation. They should be taken into consideration in the differential diagnosis of vague or chronic abdominal pain. Endoscopy is a reliable way of examination. Treatment should be conservative, leaving surgical therapy only for unmitigable bleeding, perforation and failing conservative management. The treatment of 34 children (in an age between one day and 14 years) is discussed. 26-17 of whom had bleeding ulcers--were treated conservatively, 8 had to be operated upon. 5 children suffered from a relapse (2 with bleeding), but conservative therapy led to the lesion's healing in these cases.